Penumbrous

the penumbrous calm of the cathedral interior

Source: wiktionary

Yet such Commissions were awarded, and far more frequently than might be supposed in view of the infinitely wider gulf—both social and educational—which divided the eighteenth-century Officer from the rank and file, than the penumbrous border line which separates them today.

Source: wiktionary

Everyone knows God in his penumbrous knowledge of common esse.

Source: wiktionary

This is that from which metaphor springs dissatisfying, penumbrous - the silence on occult matters, or those of predestination, of genetics or environment - and the source of circumlocution, the ambiguous alchemical directives.

Source: wiktionary